package title;

import java.util.Scanner;

/**
 * 功能：
 * 作者：lc
 * 日期：2024/12/1 2:33
 */
public class MainB2029 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double h = scanner.nextDouble();
        double r = scanner.nextDouble();
        int res = (int) Math.ceil(20000.0 / (3.14 * h * r * r));
        System.out.println(res);

    }
}
